Enjoy the Luxury of TWO custom fit filters included with each mask purchase. Our filters are made of 100% Polypropylene. We include these filters to get you through the first few weeks with your new mask. It is recommended to change out filters at least every one to two weeks for highest performance and protection in your mask. No worries, we've got you covered! Filters can be purchased as an add on to your order! Simply add your package to your cart!